The person infected did not travel and acquired the virus from someone who had been to Venezuela, the county health department said on its twitter feed. It did not provide further information on the Texas infection due to privacy concerns.
The CDC said it did not investigate how the virus was transmitted.
There have been six confirmed travel-related cases of Zika virus disease, all among residents of Harris County, where Houston is located, the Texas Department of State Health Services said.
In medical literature, there has been only one case of Zika transmitted sexually and one case in which the virus was detected in semen.
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